checking permissions and requesting permissions in android

EasyPermissionsLibrary.md

description:

• checking the permission like location permissions are accepted or not
• asking permissions
• messge when permissions are permanently denied

dependencies: inside build.gradle(app)

dependencies{
	..
	// Easy Permissions
	implementation 'pub.devrel:easypermissions:3.0.0'	
}

location permissions.md

NOTE : for android Q and above we need to add a extrapermission request for ACCESS_BACKGROUND_LOCATION

1. add a object file(LocationUtilities.kt)

    object LocationUtilities{
    	fun hasLocationPermissions(context : Context) = 
    		if(Build.VERSION.SDK_INT<Build.VERSION_CODES.Q){
    			EasyPermissions.hasPermissions(
    				context,
    				Manifest.permission.ACCESS_FINE_LOCATION,
    				Manifest.permission.ACCESS_COARSE_LOCATION			
    			)
    		}else{
    			EasyPermissions.hasPermissions(
    				context,
    				Manifest.permission.ACCESS_FINE_LOCATION,
    				Manifest.permission.ACCESS_COARSE_LOCATION,
    				Manifest.permission.ACCESS_BACKGROUND_LOCATION
    			)
    		}
    }
   

2. add a private fun (requestPermissions) in a activity or fragment which will be called in onCreate or onCreateView extend class EasyPermissions.PermissionCallbacks //lets consider MainActivity

    class MainActivity : AppCompatActivity(),EasyPermissions.PermissionCallbacks {
    	override fun onCreate(savedInstanceState: Bundle?) {
    			super.onCreate(savedInstanceState)
    			setContentView(R.layout.activity_main)
    			requestPermissions()
    	}
   
    	private fun requestPermissions(){
    		if(LocationUtilities.hasLocationPermissions(requireContext())){
    			return
    		}
    		if(Build.VERSION.SDK_INT < Build.VERSION_CODES.Q){
    			EasyPermissions.requestPermissions(
    				this,
    				"You need to accept the location permissions to use this app",
    				Constants.REQUESET_CODE_LOCATION_PERMISSION, //constant with value zero
    				Manifest.permission.ACCESS_COARSE_LOCATION,
    				Manifest.permission.ACCESS_FINE_LOCATION
    			)
    		}else{
    			EasyPermissions.requestPermissions(
    				this, 
    				"You need to accept the location permission to use this app",
    				Manifest.permission.ACCESS_FINE_LOCATION,
    				Manifest.permission.ACCESS_COARSE_LOCATION,
    				Manifest.permission.ACCESS_BACKGROUND_LOCATION,
    			)
    		}
    	}
    	//override the onPermissionsDenied and onPermissionsGranted of the class EasyPermissions.permissionCallbacks
   
    		override fun onPermissionsDenied(requestCode:Int,perms:MutableList<String>){
    			   if(EasyPermissions.somePermissionPermanentlyDenied(this,perms)){
    					AppSettingsDialog.Builder(this).build().show()
    				}else{
    					requestPermissions()
    		}
    	}
   
    	override fun onPermissionsGranted(requestCode: Int, perms: MutableList<String>) { //nothing to do here }
   
    	//override onRequestPermissionsResults()
    	override fun onRequestPermissionsResult(
    		requestCode: Int,
    		permissions: Array<out String>,
    		grantResults: IntArray
    	    ) {
    		super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    		EasyPermissions.onRequestPermissionsResult(requestCode,permissions,grantResults,this)
    	    }
    }